Phonograph record demonstrator



ALEXANDER LlsslANsKY 2,626,158 Now B Y CHANGE oF NAMEv ALEXANDER LISSANCE PHONOGRAPH RECORD DEMONSTRATOR 5 Sheets-Sheet 1 Filed July 5'. 1948 INVENTOR. Z ALEXANDER LISSIANSKY NOW BY CHANGE 0F NAME ALExANDER LISSANCE Jan. 20, 1953 ALEXANDER' LlsslANsKY 2,626,158

Now EY CHANGE oF NAME YALEXANDERLlssANcE PHONOGRAPH RECORD DEMONSTRATOR Filed July 3, 1948 N www vm Rum v mmm vnf EN a? www NA t mw NY nuu L@ MEN BVM Mw Jan. 20, 1953 ALEXANDER LlsslANsKY 2,626,158

Now BY CHANGE oF NAME ALEXANDER LlssANcE PHONOGRAPH RECORD DEMONSTRATOR Filed July 5. 1948 5 Sheets-Sheet Z5 INVENTR. ALexANosn ussmnsxv Now sv 73a/ :uns: orwmc mensuel: ussmce JanfZO, 195,3 l 'ALEXANDER I lsslANsKY 2,626,153

NOW BY CHANGE OF NAME ALEXANDER LISSANCE PHONOGRAPH RECORD DEMONSTRATOR Filed July i5,1 1948 5 Sheets-Sheet 4 INVENTOR. mexANosR ussmuskv Now cannon oF MM: Ansmann ussn Jam 20, 1953 ALEXANDER LlsslANsKY 2,626,158

Now BY CHANGE oF NAME ALEXANDER LlssANcE PHONOGRAPH RECORD DEMONSTRATOR Figled July 3, 1948 5 Sheets-Sheet 5 INVENTOR. ALExANoER ussmNsKY Naw Bv CHANGE 0F NAME ALExANoe ussnuce Patented Jan. 20, 1953 UNITED PHONOGRAPH RECORD DEMONSTRATOR Alexander Lissiansky, New York, N. Y., now by change of name Alexander Lissance Applicationsuly a, 194s, seria1'N0.ss,ss7

8 Claims. (Cl. 274-14) This invention relates to tone reproducing apparatus and more particularly to a machine for playing various sizes of records. v

It is one of the objects of this invention to provide means facilitating playing of records of predetermined size in any desired sequence and to any desired extent (such as M1, 1/2, 3%; etc. of a record or records) It is another object of this invention to provide means rendering a preset period of time for playing record or records possible without regard to the size of the record or records used.

It is still a further object of the invention to provide meansautomatically regulating the driving and adjusting mechanisms of record playingmachines as to starting as well as finishing positions.

vision of means permitting automatic start of the tone reproducing apparatus upon placing a record on the turn table thereof and causing automatic withdrawal of the needle carried by the tone or pick-up arm from said record upon removal of the latter from the apparatus. Still a further object of the invention is to provide means affording automatic separation of the driving-,mechanism from the cam or control mechanism of the apparatus upon engagement ofthe needle with the record grooves and/or upon termination of the needle. operation, whereas any overrun of the mechanism is effectively avoided and the employment of any brakes will become unnecessary.

Another object of the invention resides in the 4provision of means offering the possibility of constructing a portablel apparatus which may also be used in record stores and other commercial establishmentsfor playing or trying out any record discs, for example by an interested purchaser without being able in any way to damage the record discs or the needle of the apparatus.

Still another object of the invention is to provide means ensuring substantially instantaneous stop of the apparatus, avoiding transfer of inertia from-the motor to the driven parts of the apparatus and reducing the weight of these parts to an extent that economical, efficient and uniform operation of the apparatus will always be achieved.

A still further object of the invention is to provide means enabling a very simple and inexpensive construction of a phonograph record demonstrating apparatus, which is sturdy, withstands considerable wear, and is substantially foolproof so that any injury or damage of phonograph records, needle and other vital parts of the apparatus will practically be impossible.

These and other objects of the invention will be pointed out in the following description and claims and illustrated in the accompanying drawings which disclose, by way of example, the principle of the invention and preferred modes which have been contemplated'for applying said principle. y

In the drawings:

Fig. 1 is a top plan View of the phonograph record reproducing or demonstrating apparatusas seen from the top plate and with parts thereof broken away;

Fig. 2 is a sectional view of the apparatus taken generally along line 2-2 ofFig. 1, parts thereof being broken away;

Fig. 3 is a sectional view of the support of the pick-up arm shown in record playing position;

Fig. 4 is a detail View of a switch arrangemen employed in this invention;

Fig. 5 shows diagrammatically the wiringand the switching arrangement of the apparatus;

Fig. 6 is a perspective View of the cam vor control mechanism with clutch employed in this invention; v v y Fig. '7l is a vertical section through the cam mechanism of Fig. 6; .4

Figs. 8, 9, 10 and 11 show the cam mechanism and the parts controlled thereby in various positions and seen generally along line 8-8 of- Fig. 2, the chassis plate of the apparatus being omitted for claritys sake.

Referring now more particularly to the drawings, there is shown in Fig. 1 the phonograph record reproducing apparatus 20 with cover 2|, which has an opening 22 through which extend the platform 23 and center pin 24 for receiving and centering a conventional record disc 25, which frictionally engages platform 23, theVA latter being rotated by a drive from motor M, as will be later described. i

Top or cover 2| is further providedwith an arcuate slot 2G through and along which* the phonograph needle 21 may move to operative and inoperative positions.

link bar 65.

The apparatus 26 has further a base 28 to which is fastened at 29 the housing or casing 38 which is closed by an upper chassis -plate 3|. Chassis plate 3| and cover 2| are removably attached to the upper, recessed rim of casing 39 by means of screw bolts 32.

Chassis plate 3| carries at its underface the driving. mechanism 33I with pulley 34 and transmission element 352 and further the calm plate mechanism or control means 39 including the coupling device 31 of the latter. Accommcdated in housing 39 is motor M, motor switch 38 and relay switch 39, as well as liftpin 4|' for controlling pick-up arm 46 of the apparatus. Pick-up arm 48 is journalled and supported on the upper surface of chassis plate 3| and is adapted for movement below cover 2| and relatively toits slot 26.

Between cover 2| and chassis plate 3| there is Ydisposed a turn table 42 which is attached to V tin if the apparatus is' used for playingr or trying utl'Z records instead of l0 records, as wil] be later on described.

The apparatus' 20 just outlined is constructed lin such a manner that it fulfills practical re- VQluii"ements and purposes and can be used for tone reproducing of a conventional record ras well as ofA a conventional 12 record disc which is to be operated toV play for the full extent f the recording, for a preset portion thereof, or'the" record disc may be removed from the platform of the apparatus by the operator at any desired lapse of time determined by the Start and finish of the playing of the record disc. In all these operations it will become necessary that the apparatus is reset to starting or zero position, whereby the needle of the apparatus is enabled to play again a record disc within the shortestV period of time. Y

In order to moreV fully explain the aforesaid purposes, reference is rst made to Fig. 5 which shows diagrammatically the function of the main parts of the apparatus.

Upon placingv a record disc 25 (Figs. 2 and 3) on the center pin 24. the same is moved inthe direction A and against pressure of spring 45 lengthwise of guide sleeve 46 until the lowermost end 41 of said pin abuts against relay switch arm 48 which causes displacement of contact arm 58, the latter normally closing contact 49 and contact 5|. Due to this displacement, contact shoe 49 will make contact with contact shoe 52, whereby the' following electric circuit is established: Leg 60 of power line AC, conductor 54, contact arm 59, contact shoe 49, Contact shoe 52,. conductor 55, contacts 56, 51, conductor 58, relay 59 (which is magnetically latched) and leg 6| of power line AC.

Energization of relay 59 causes armature 53 to be attracted, the latter moving about pivot 62 against the action of spring 63. Movement of armature causes rod 64 carried by the latter to engage the cam-shaped end 66 of link bar 65 whereby a swinging movement of said link bar 65 is performed about pivot 61 and against the action of spring 68. As a consequence thereof, pusher bar`18 is driven in the direction f arrow B, since said bar is pivotally connected at v69 to Link bar 65 is further provided with a cam-shaped end piece 1| which is adapted to abut against a link 12 which, in turn, is pivotally supported on a pin 13 from the chassis plate- 3|. Link 12 carries a pin or like element 15 adapted for cooperation with the aforesaid coupling device 31 (Fig. 6) and is normally held by suitable spring means 14 in abutting relation with cam end 1|, as shown in full lines. As soon as pusher bar 10 is displaced, link 12 assumes a position 12 seen in dot-dash lines with pin 15 in a position 15'.

Pusher' bar 19' has a forward end 16 provided with a nose or spur 86 which is adapted to cooperate through abutment pin 18 with link 89 in such a manner that the latter is swung about its pivot-11' (fixed. to the chassis plate 3|) to the dotted line position 89. A further pin 19 is carried by the free end of link and is adapted to coact with a lever 8| of the motor micro switch 38; Pin 19-is also adapted to cooperate with the coupling device 31 (Fig. 6), as will be later described. Y

Link 80 is normally held in a position shown in full lines and on account of the displacement of pusher bar 'lll (in the direction of arrow B) is swung about pivot 11' to position 8.0 whereby pusher, pin 19 acts against lever 8| and. brings about closing of contacts 82r and 83 of motor switch 38 which causes motor M to be included in the power line AC for starting said motor.

In order to retain lever 8| in its position 8|', a spring 84 is employed which performs a toggle action and holds link 80 in the dot-dash line position 89. Link 8!) is further prevented from return to its full line-position by the engagement of pin 18 with nose 86 provided at the forward end 16 of pusher bar 16. A recess 85 is provided rearwardly of nose 86 and is defined at the opposite side of the latter by alight leaf spring 81 carried by bar 18 and for a purpose later referred to.

It will be realizedv from the aforesaid disclosure that upon actuation of link bar 65 at 64 and 66, flow of electriccurrent between contact pieces 56 and 51 will be interrupted, whereas contact will be established between contact piecesy 51 and 51a, conductor 55av connecting now the latter contact with contact shoe 5| at which the circuit is interrupted, as long as the record disc engages center pin 24 as aforesaid.

Motor M. as is well understood, rotates through transmission element 35 pulley 34 which is journalled on axle 99, the latter being anchored on chassis plate 3|, whereby pulley 34 is driven in a direction indicated by arrow C.

Upper surface 99a of pulley 34 is provided with a predetermined number of recesses 9|, spaced from each other and adapted for engagement with a pawl 92 forming part of the coupling device 31. This coupling device is secured to the underface 93 of cam plate or wheel 36 at 94 and extends between said cam plate and' said pulley. A screw bolt 96 pivotally anchors pawl 92 and projecting slide member on a holder 940 whereby member 95 may reciprocably move in the direction of arrows D and D|. Slide member 95 has an upper, somewhat curved engaging surface 91 adapted for cooperation with pin 15 of link 12 and pin 19 of link 89 (Figs. 5 to 7). Further aixed at 99 to underface 93 of cam plate 36 is a leaf spring 98 which acts on pawl 92 to press the latter into any of the selected recesses 9|, as will be later explained.

The upper surface 93a of cam plate 36 carries a reset pin |99 and an elongated groove IDI having the sloping end shoulders |92 and |83. Reset pin |98, as will become clear from Fig. 5, is disposed in the path of lever 88 (when the latter assumes its displaced position indicated accents path of lift pin 4|.

During rotation of pulley 34 (and as long as ,y

`motor M is switched on), links 80 and 12 are maintained in their respective positions 80 and 12. As a consequence thereof, pin 19 is out of the range of coupling member 95 which is free to swing in the direction of arrow DI and to permit engagement of pawl 92 with one of the recesses 9| of the pulley 34.

Thus, pulley 34 and cam plate 36 are rotated in unison until member 95 arrives at and engages with its surface 91 pin 15 (which assumes its positionV 15'), whereby pawl 92 due to the movef ment of member 95 in the direction of arrow D is withdrawn from recess 9| and pulley 34 is `allowed to further rotate While cam plate 36 lis stopped. During this stage of rotation of pulley 34, the tone reproduction of the record disc takes place.

As will be later on explained in detail, upon termination of the tone reproduction of the record disc, it will become necessary to switch i off motor M. This is eifectuated by moving link 80 and pin 19 from the dot-dash line positions 80', 19 back to full line positions, whereby springy micro-switch arm 8| is forced from position 8| to its initial or full line position and thus brings about separation of contacts 82, 83.

In the event that it will be desired to remove or lift the record disc from center pin 24 before the tone reproduction is finished (for example, when trying out a record disc and playing only a I part of it), disengagement of pin 41 from lever 48 will occur, thus bringing contacts 49. and 5I again into engagement with each other, whereby a circuit is closed passing through leg 60, conductors 54, 50 and 55a, contact shoes 51a, 51 (which are still engaged due to the magnetic retentiveness of core of relay 59), conductor 58 back to leg 6|, whereby, however, a reversal of againstnose 86 and swinging of link 80 from its position 80 to full line-position is subsequently effectuated when reset pin strikes lever 88 (while still in position 88') whereby lever 8| with pin 19 are moved back from outward position 8| and 19 to full line-position (Fig. 5) and thus cause interruption of contacts 82, 83 of the motor switch 38, whereby the motor drive comes to a stop.

As can be seen from Fig. 6 within the space between chassis plate 3| and cam plate 35, there are positioned besides the aforesaid links 12 and 80 a spiral-shaped pick-up cam member |04 and a selector cam |05, the latter being placed on top of the cam member |04, whereas said cam member |04 is affixed to the upper surface 93a of cam plate 36.

Further depending from and supported by chassis plate 3| is a selector disc |06 which carries at its underface a pin |01, which is adapted to engage the cam periphery |05a of selector .cam |05 in predetermined position of the latter.

' Movably connected to selector disc |00 is a V- plate 3|.

shaped element |08, which is positioned on the top surface of chassis plate 3| and is joined to said selector disc |06 by Ameans of a screw bolt |09 passing through a suitably shaped slot ||0 provided in the chassis plate 3|.

The V-shaped element |08 has a forwardly slopingabutment piece against which the forward end of selector finger 43 comes to rest, in the event that a l0 record disc is used (Figs. 8 to 11) but over which said forward en d of selector finger 43 rides to extend over the surface of V- shaped element |08, in the event that a 12" record disc is to be operated (Fig. 1).

V-shaped element |08 is swingable about pivot 08a and is held in normal position by means of a spring |081). Selector disc |06 carries at its underface a stop pin II2, which is employed when the apparatus is to play 12" record discs (Fig. 1), as will be later explained.

A further stop pin I5 extends from the underface of chassis plate 3| to limit the movement of release lever |20 which is adapted to cooperate with a pick-up lever |2| whose operation is about to be described.

Release lever |20 and pick-up lever 2| are also positioned between chassis plate 3| and pickup cam |04 (Fig. 2). Pick-up lever |2| is supported for pivotal movement by a sleeve member H6 through which passes lift pin 4|. Sleeve member 6 forms also a support for the pick-up arm 48 and carries the aforesaid pick-up lever |2| underneath chassis plate 3| by means of screws ||1 and washer ||8 (Fig. 3).

Release lever |20 is held in position by means of a suitable stud ||9 which is anchored on the chassis plate 3|, said lever |20 being adapted to move lengthwise of its slot |22 which engages stud H9.

Release lever |20 is further under action of spring |23 which extends between one extremity |24 of said release lever and an anchoring pin |24a fixed to chassis plate 3|.

The opposite extremity of lever |20 is provided with a notch |25 for the engagement with a pin |26 attached to the pick-up lever |2| (Figs. 8 to 10). Pick-up lever |2| is further provided with a fixed edge |30 to which is relatively movable a heel or projection |23 which is rotatably and frictionally held by means of a tightrivet |21 on lever |2|. Thus, heel |28 may be swung about said rivet to relatively adjust said heel piece |28 to said pick-up lever |2|. Markings or suitable graduations |3| are provided at one end of said lever |2| with which handle |29 cooperates, whereby swinging movement of handle |29 relatively to said markings brings about displacement of heel |28 to a position, ls'ay, |28 (Fig. ll) with respect to fixed edge |30 of said pick-up lever l2 Thus, heel |28 is enabled when suitably displaced to abut against and actuate link 12 while the latter is in position 12', as will be later referred to.

Release lever |20 carries on its surface a stop pin |32 for the abutment of release link |35 which is pivotally supported at |33 on chassis To the free end of release link |35 there is affixed a guide pin |34 adapted to engage the peripheral cam surfaces |36 (projecting part) and |36a (recessed part) of cam plate 36.

Adjacent notch |25, there extends a wire spring |31 which is anchored on stud |31a, the latter 7 under the; action of a spring |52` which extends between end |33 of pawl |40 and a stud |44 supported by chassis plateV 3|.

Pawl |40 is. provided with a projecting tooth |455 adapted to zoact with one of the peripheral teeth |39 of extension |38 asv indicated in dotted position |3301,- ofy said extension (,Fig.. ll).

In; Fig. 3- the support for the pick-up arm i0 is shown in greater. detail from which it becomes clear that-arm 49 may swing in upward and downward directions E, E about pivot |53 which is carried by a bracket |5I on which is anchored at |53 a spring |52, the latter being connected to the extremity |54 ofthe pick-up arm 40.. At the opposite extremity |55 of pick-up arm 40, there is attached a holder |55 for. the pick-up cartridge 21a. and needle 21, the latter passing when in operative position through slotZt of cover 2| to play the underside. 25a of record disc 25.

Vertical movements of needle 21 in the. directions E. E! are controlled by groove |0| of cam plate 36 and lift pin di. Upper end da of lift pin 4| is adapted to abut against the underface of pick-up arm 139 whereby pivotal movement of pick-up arm 0 against the action of spring |52 about fulcrum |50 may be effectuated.

Horizontal movements of needle 21 in the direction of slot 26 are transmitted by sleeve l I6 from pick-up lever |2| when the latter is freed upon disengagement thereof from release lever |23, as

. referred to hereinbelow.

Assuming now that the tone reproduction of a record disc is to be performed to the full extent of its recording, and further assuming that a 10 record disc is used, it will become apparent that such disc 25 mustA be first placed on center pin 24 for engagement with platform 23. EX- tension pin l1 recedes then Within guide sleeve 46 and Causes by means of relay switch arm i3 establishment of an electric circuit passing through contact shoes 49, 52 of relay switch 39 and contacts 56, 51, as hereinabove mentioned, to start motor M. Transmission element 35 operatively connects pulley 35 with grooved wheel |60 which is supported by a thrust bearing |6| on a bracket |62. This bracket is affixed to the underface of chassis plate 3| at |53. Wheel |60 is keyed to a sleeve |63 which in turn is fixed to the hub 55 of the flywheel or turntable i2 which is rotated by motor M through the intermediary of friction wheels |53, |61, the latter engaging the inner flange alla of turn table (l2 (Fig. 1). Any well known spring supported tensioning means |53 may be employed to ensure frictional engagement of said wheels |35, |51 and inner ange c2c.

When motor M is switched into the aforesaid circuit, links 12 and 80 assume their respective positions indicated by numerals l2 and 80' as hereinabove explained, whereby pulley 36| is rst coupled with cam plate 36 which carries on its surface spiral cam member |03 and selector cam |95. The forward end |10 of selector finger d3 which swings about pivot |69 on chassis plate 3| is not engaged or touched by the l0 record disc 25 and comes into abutting position with abutment I of element |58, the latter being under the action of spring |08b.

As can be gathered from a comparison of Fig. 8 with Fig. 9, pin |01 on selector disc |03 engages the peripheral edge |05a of cam member |05 and gradually leads abutment piece toward the forward end |10 of selector finger 43, whereupon pin |01 is disengaged from cam member |85.

During the continued rotation of cam wheel 36 coupled with pulle-y 3d, pin |26 of the pick-up lever |2| runs. off from. the outer cam surface. of pick-up cam |04 (Fig. l0) and is. permitted to moveout. of groove |25 of release lever |20.. However before release lever |20 becomes. disengaged fromy pick-up lever |2.|, as will be described hereinafter and duringthe aforesaid stage of rotation lift pin 3|- which actuates the. pick-up arm 40 is guided from shoulder or ramp |02 of groove liilr to the deepest part thereof (Figs. 11 and 3) whereby the lift pin end Il la becomes disengaged from pick-up arm 59 which under the action of spring |52 leadsneedleZl through slot 26. of cover plate 2| for contact with the underface of record disc 25.

Thereafter, releaselever |20A is moved in lengthwise direction (away froml pick-up lever |2|) by release link 135while release lever |20 is in abutf tingy relationr with 10" record regulating. pin. |15.

Release link. |35 during this movement engages pin |32 of release lever |23 and receivesits movement through ther engagement of pin It riding on projecting cam surface |36.

As soon as pick-up lever |2| is being disengaged from release lever |23 lead spring |31 becomes eective and kicks and swings pick-up lever |2| about sleeve. l a in the direction of arrow F thus ensuring the engagement of needle 21 with the rst groove of the record disc.

As soon as slide member on cam plate 35 arrives at link 12 pin 15 thereof comes in contact with and depresses said slide member and thus causes disengagement of cam plate 3S from driven pulley 34.

Pick-up arm le led by the engagement of needle 21 with the record grooves is` free to move together with sleeve H3 to which is fastenedv pickup lever 2| as hereinabove set forth (Fig. 3).

Pick-up lever |2| moves in the direction of arrow F commensurate with the advance of needle 21 in the record disc grooves Zea and after about, say, half of the record disc is played causes engagement of arcuate toothed end |39 of lever extension |38 with tooth |45 of pawl |40, the latter being swingable about pivot Mi.

Thus, tooth engagesA successively the teeth of end |39 until needle 2? has completed its operation and enters the spiral center or eccentric groove of the record disc (not shown). As a consequence thereof, needle 21 performs to and fro motions which cause sleeve or bushing H6 to swing likewise back and forth and to transmit the same swinging movements to the pawl engaged toothed end |39, which assumes the position indicated by numeral las@ (Fig. 11).

This reciprocal swinging movementv of end |39 is further communicated to pawl end Ia, which comes in contact with link 12 and displaces the latter (about pivot 13 and against the action of spring 1li) so that it moves from position 12 to the dot and dash line position 12 (Fig. 11) in which pin 15 will be disengaged from slide member 95 of coupling device 31.

Following this disengagement of pin 15 (moved from full line position 15 to dot and dash line position) from slide member 95, pavvl 92 falls into one of the recesses 9| of pulley 34 to thereby couple cam plate 36 to the latter which. starts again to rotate until reset pin |00 later on abuts against arm 88 (in position indicated by numeral 08') of link 80. Displacement of arm 88 acts through pin 19 on microswitch arm 8| which opens contacts 82, 83 of the motor circuit, as hereinabove set forth.`

Prior to the action of reset pin |00 the follow- 9.. ing motions take place (while cam plate 36 and pulley 34 rotate together) (l) Lift pin 4| is immediately moved out of groove and engages the top surf ace 930!r of cam plate 36 whereby the upper end 4|a of pin 4| presses against pick-up arm 40 to swing the latter yabout pvot |50 in the direction of arrow G so that needle 21 is Withdrawn from the eccentric groove of the record disc 25.

(2) Needlev 21 is guided out of slot 26 back to its starting position on account of the return of pick-up lever I 2| to its engagement position with release lever |20.

To this end, during the rotative stage of cam plate 36 cam member |04 comes to engage pin |26 of lever |2| which is gradually led or swung back to starting position (Fig. 8). During this swinging movement disengagement of paw1 tooth |45 from toothed extension end |39 takes place since the latter moves in a direction opposite to that of arrow F. Pin |26 engages in this starting position against notch |25 of release lever |20. p (3) As soon as pin |34 of release link |35 encounters again lower part |36a of cam plate |36 release lever |20 moves in lengthwise direction toward pick-up lever |2| and permits engagement of pin |26 (still guided by cam member |04) with notch |25, as will be well understood (Fig. 8).

(4) Forward end |10 of selector finger 43 becomes disengaged from abutment edge since pin |01 of selector disc |06 comes in contact with the highest point of cam surface |a of selector cam |05 (Fig. 8).

It will be observed that when reset pin |00, as above stated, opens the motor circuit passing through conductors 54, 54a, record disc 25 may still rest on center pin 24. However, in order that link 80 together with arm 88 and pin 18 may be displaced about pivot 11 from dot and dash line position 30' to the full line position, pin 18 has to overcome abutment or nose 86 of push bar 10, which is still in its extended position (indicated by arrow B) This is achieved by the fact that pin 18 (during the displacement of link 80 from position 80" to full line position) forces light spring 81 to give sidewardly and enters recess 85.

Only after record disc 25 has been nally removed from center 4pin 24 will an electric circuit be established which includes again contact shoes 49 and 5|, the latter contact leading to conductor 55a and closed contacts 51a, 51 (which are still engaged due to the magnetic retentiveness of the core of relay 59) to thereby produce in said relay 59 through coil 58 a reversal of the current flow which de-magnetizes said relay 59. Return of armature 53 through spring action 63 and of link bar 65 and push bar 10 (the latter moved in the direction of arrow B1) to respective initial position is thus achieved (Fig. 5) as above explained.

It is obvious that return movement of push bar y in the direction of arrow B1 permits push pin 18 to move relatively to said push bar 10 and out of recess 85 past spring 81 so as to assume again its initial and abutting position in front of nose or projection 86, as seen in Fig. 5.

. From the above description it will become apparent that all movable parts of the apparatus are now reset to starting positions. If it will be desired to employ the apparatus 20 for playing a l2l recording disc 25h the latter .is brought into engagement with center pin 24 for contact with abutment ring 24a thereof. As a consequence thereof selector nger 43 whose 10 tip is in the path of and touched by disc 251), is displaced and swung (against light spring 43c) to a position 43a within slot 43D whichis provided in cover plate 2| (Fig.v l). Selector nger 43, as hereinabove stated, is swingably supported by pivot |69 on chassis plate 3| and Will permitl in its position 43a that forward end |10 clears abutment edge since end |10 is lifted to the dot and dash line position as seen in Fig. 1.

As soon as recording disc 25h engages center pin 24 and is placed on platform 23 the aforesaid electric circuit (see Fig. 5) is actuated to start motor M for driving pulley 34 and to bring about coupling of the latter withA cam plate 36.

As hereinabove stated, due to the movement of cam plate 36 cam |05 (Figs. 7 and 8) is rotated and engages pin |01 of selector disc |06 at its largest radius whereby, in the present instance, and in contradistinction to the above explained condition with respect to a 10 record disc the forward end |10 of selector finger 43 is lifted to the surface of the V-shaped element |08, clears abutment (duringthe further relative movement between pin |01 Yand cam surfacel |05a) and thus causes disengagement of the tip of selector nger 43 (in position 43a) from the underface of record disc 2511. Pin |01 becomes subsequently disengaged from said cam surface |0541 (Figs. 8 and 9) Thus, selector disc |06 is permitted to rotate about pivot |08a under the action of spring v|0811 until screw bolt or stop |09 comes to abut against the end 0f slot H0 (Fig. 1), thus bringing automatically 12" record regulating pin ||2 into engagement with release lever |20.

During the still continued rotation of cam plate or wheel 36 pin |26 of pick-up lever |2| disengages pick-up cam |04 (as set forth in connection with the playing of l0 recording disc) and disengagement of pick-up lever |2| from release lever |20 takes place, the latter being then in contact with pin I2.

Operation and function of the apparatus are otherwise the same as elucidated with respect to the playing of 10 recordings.

If it should become necessary and as it is desirable for phonograph record demonstration in stores and other establishments where record discs are tried out provision has been made according to this invention to preset the extent of the record disc to be played, namely, to 1/4, V2 or of the full recording. To this end, the adjustable heel or abutment means |28 pivoted at |21 will be manually operated or swungv (by means of handle |29 along markings I3l) toan advanced position indicated by numeral |28'v and is caused to actuate link 12' before toothed periphery |39 will be rocked and moved to and fro due to the engagement of the needle 21 with the eccentric end groove (not shown) of the recording disc.

Otherwise, the successive steps in the operation of the apparatus remain the same, whereby cam plate 36 will be coupled to move againtogether with pulley 34 for resetting the apparatus.

For sake of clarity it is to be noted that pins. such as 13, 11, |24a, |33 etc. forming either pivots or anchoring means for springs, such as 63, 68, 14, 84, |23, |42 etc. are fixed to the chassisplate 3| in any appropriate manner and are indicated more diagrammatically in the drawings.

It is well obvious that the center pin arrange'- ment, the control means for the tone arm, the selector means for V,various diameters of record Y 11 Y Y discs, .adjustable means 'for regulating and presetting the extent of the record disc to be played may belikewise applied to phonograph apparatus equipped with a tone arm for playing the top or upper surface of the recording.

v-As will be realized from vthe above disclosure of the operation of the apparatus, cam plate 36 will always complete a single revolution regardless whether the recording disc has been played to the full extent or to a portion of the recording grooves, while the pulley 'is operatively connected tothe lmotor drive and performs a number of revolutions.

The various features of the invention may be employed either `singly or in combination and the various structural elements may vary in size, shape, .form and relative arrangement. The apparatus herein disclosed is of practical construction, reliable, rigid 'and eflicient in use and operation and adapted to accomplish among others, all of the objects and advantages :herein set forth.

VHaving thus described the invention, what is claimed as new and desired to be secured by Letters Patent, is:

l. VIn la tone reproducing apparatus having a cover plate, a chassis plate below said cover plate, a tone arm supported by said chassis plate and adapted to carryan element for engagement with the recordinggrooves of va disc, a motor, .a Vplatform for lsaid .disc and rotatable within an opening .of v:said icover plate, and 'transmission means connected .to ,said motor for operating said platform; a pulley journalled on said chassis plate, and 'in driving connection with said motor, a plurality .of cam means positioned .above said pulley, means carried by and adapted to couple said cam means with .said pulley and for .release therefrom, a pick-up lever Vcontrollable by one of said cam means and connected to said tone arm, whereby said pick-up lever is moved from vstarting position to a predetermined position in which said tone rarm element is disengaged from said recording grooves, .a oawl member pivoted to said .chassis plate, toothed means carried by said pick-up lever and -cooperable with `vsaid lpawl member "in said predetermined position Vof said pick-up lever, said pawl member being vactuable by said pick-up lever yin -said predetermined position and being operatively connected with said coupling means to cause engagement-cf said cam means with said *pulley whereby said pick-.up lever is moved by said Vcam means to starting position, vand `a lift pin passing Vthrough Vsaid pick-up lever, -said lift pin being controllable by anotherof said cam means and being engageable with said tone arm, whereby the latter is '-moved by 'said pick-up lever -in one direction vandby said lift lpin in a direction perpendicular to -said one direction, said cover plate being provided with a .passage for said tone -arm .element when moved toward vand from said recording disc .in accordance with movements of said tone arm.

, 2. In an apparatus according to claim l, including selector means journalled on said chassis plate, said selector means vcomprising a selector finger, and a selector disc provided with stop means and adapted to cooperate with said selector finger, said selector finger extending above said cover plate for contact with a recording disc of predetermined diameter whereby the position of said stop means of said selector disc will be changed, and release means regulating the starting position of sai'dpick-up lever and engageable 12 with said stop means when .said predetermined recording disc is employed.

3. In an apparatus according to claim 1 including Ya center pin engageable With said disc and passing through said platform, and switch means including an electric circuit, said switch means being arranged below said platform and cooperating with said center ,pin to regulate supply of electric current 'to said motor.

4. 'In a tone reproducing apparatus for 'recordings; an electric power source including ele'ctric circuit means, a rotatable platform for supporting a recording disc, said ,platform being operatively connected to said power source to `be set in rotation by the latter, a displaceable 'center pin engageable with and facilitating 'guidance of said recording disc onto and from said platform, 'switch means actuatable upon displacement of said center pin to close said circuit means, a tone arm having a starting position and including an element adapted to cooperate with said recording disc, control means for regulating movements of said tone arm and 'operatively connected for movement to said platform, manually operable means operatively 4connected to said tone arm and vadapted to cooperate with said control means to thereby cause `reset of said tone arm to starting position Nafter the latter has reached a -predetermined position Vbeyond said starting position, and means .forming part of said tone arm control means and actuating through the latter said switch means to thereby open in said starting position said circuit means and to disconnectI said power source therefrom.

5. In a tone reproducing apparatus `for recordings according Vto .claim 4, wherein said `manually operable 'means is in the form of a swingable lever, said tone arm including a lpick-up lever, said swingable lever being adjustably and pivotally attached to said pick-up lever and movable relatively to the latter, said swingable lever being adaptedto actuate said control means in said predetermined position of said tone arm.

6. In a tone reproducing apparatus for recording disks; the combination of a power driven platform for supporting a recording disk, with electric switch means including lan electric circuit and adapted `to operate the Apower Adrive of said platform, a tone arm including a holder for a needle for engaging said recording disk, movably arranged mechanical control means for regulating movements of -said tone arm relative to said recording disk, adjusting means extending from said control means and for abutment against a portion of said switch means to open said circuit, whereby the movement of said tone arm is defined with respect to a predetermined part of said recording disk, and va center pin passing through said platform and arranged for` displacement with respect to the latter upon engagement with said recording disk whereby said center pin abuts against another portion of said switch means to close said circuit.

7. In a tone reproducing apparatus according to claim 6, wherein said control means includes a pick-up lever which is operatively connected to said tone arm, said pick-up lever pivotally supporting said adjusting means.

8. In a tone reproducing apparatus according to claim 6, wherein a pulley is arranged for moving said control means which is coaXially arranged on said pulley, transmission means for transmitting Amovement from said platform to said pulley, and coupling vmeans arranged inter- 13 mediate said control means and said pulley to Vregulate the movement of said control means with respect to said pulley.

ALEXANDER. LISSIANSKY.

REFERENCES CITED The following references are of record in the le of this patent:

UNITED STATES PATENTS Number Name Date 1,069,784 Hodges Aug. 12, 1913 1,429,839 Boswell Sept. 19, 1922 Number Number 

